General Properties of Lanthanoids

The pair of lanthanides in which both elements have high third-ionization energy is:

How many reactions represent correct products :

(i) Ln (Lanthanoid) $\underset{\mathrm{Halogen}}{\overset{ \mathrm{with}}{\to }}{LnX}_2$

(ii) Ln (Lanthanoid) $\underset{{\mathrm{O}}_2}{\stackrel{\mathrm{\Delta }}{⟶}}{\mathrm{Ln}}_2{\mathrm{O}}_3$

(iii) Ln (Lanthanoid) $\underset{{\mathrm{N}}_2}{\stackrel{\mathrm{\Delta }}{⟶}}{\mathrm{Ln}}_3 \mathrm{N}$

(iv) Ln (Lanthanoid)$\underset{∆}{\overset{\mathrm{S}}{\to }}{\mathrm{Ln}}_2{\mathrm{S}}_3$

(v) Ln (Lanthanoid) $\underset{{\mathrm{H}}_2\mathrm{O}}{\overset{\mathrm{Wih}}{\to }}\mathrm{Ln}{\left(\mathrm{OH}\right)}_3+{\mathrm{H}}_2$
(vi) Ln (Lanthanoid) $\underset{ \mathrm{acids}}{\overset{\mathrm{with}}{\to }}{\mathrm{H}}_2$

Among $\mathrm{Ce}\left(4{\mathrm{f}}^{1}5{\mathrm{d}}^{1}6{\mathrm{s}}^2\right), Nd\left(4{\mathrm{f}}^{1}6{\mathrm{s}}^2\right), \mathrm{Eu}\left(4{\mathrm{f}}^{7}6{\mathrm{s}}^2\right)$ and $\mathrm{Dy}\left(4{\mathrm{f}}^{10}6{\mathrm{s}}^2\right)$, the elements having highest and lowest $3$rd ionisation energies, respectively are

Paramagnetic ion is

Which of the following statement is not correct :

Which of the following lanthanoid ions is diamagnetic ? $($Atomic number of atoms, $\mathrm{Ce}=58,\mathrm{Sm}=62,\mathrm{Yb}=70,\mathrm{Eu}=63)$

Which of the following pairs of ions is expected to show colour in aqueous solutions?

Which of the following is used as a good oxidising agent in analytical chemistry ?

Which of the following is most basic ?

Spin magnetic moment of lanthanide ions is determined from which one of the following relation :

Knowing that the chemistry of lanthanoids $\left(\mathrm{Ln}\right)$ is dominated by its $+3$ oxidation state, which of the following statement is incorrect?

The number of gaseous product(s) are formed on the basis of following reactions :

              (Chemical reactions of the lanthanoids)

Which of the following is most basic ?

Anti-penultimate electronic configuration of a trivalent lanthanide ion is 4f³ and has similar colour in aqueous solution as another trivalent lanthanide ion having anti-penultimate electronic configuration of

Incorrect statement is:

Which among the following is strongest base ?

Find the incorrect statement.

Number of colourless lanthanoid ions among the
following is _________.

Eu³⁺, Lu³⁺, Nd³⁺, La³⁺, Sm³⁺

How many of the following are colourless?

${\mathrm{La}}^{3+}, {\mathrm{Eu}}^{3+}, {\mathrm{Sm}}^{3+}, {\mathrm{Nd}}^{2+}, {\mathrm{Lu}}^{3+}$

Diamagnetic Lanthanoid ions are: